EP 0491822 B1 19960821 - AN OPTICAL DETECTOR
Title (en)
AN OPTICAL DETECTOR
Title (de)
OPTISCHER DETEKTOR
Title (fr)
DETECTEUR OPTIQUE
Publication
Application
Priority
- GB 9001416 W 19900913
- GB 8920733 A 19890913
Abstract (en)
[origin: WO9104617A1] An optical detector for use in detecting digital optical signals has an optical fibre coupler (2) which splits a received optical signal into two signal portions. The coupler (2) has unequal length output fibres (8, 10) so that one signal portion impinges an associated photodetector (12, 14) delayed relative to the other. The photodetectors (12, 14) are connected in series non-opposed. When the delay is equal to the bit period of the optical signal the output of the detector is the differential code (dicode) of the received signal which can be recovered by a high input impedance, i.e. integrating, amplifier. By forming the dicode in the optical domain in this manner large DC and AC dynamic ranges are obtained without linearity constraints on the optical transmission source that apply when the optical signal is transmitted as a dicode.
IPC 1-7
IPC 8 full level
G01J 1/02 (2006.01); G02B 6/00 (2006.01); H04B 10/67 (2013.01); H04B 10/69 (2013.01)
CPC (source: EP KR US)
H04B 10/60 (2013.01 - KR); H04B 10/67 (2013.01 - EP US); H04B 10/69 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 9104617 A1 19910404; AT E141735 T1 19960915; AU 636917 B2 19930513; AU 6415290 A 19910418; CA 2066599 A1 19910314; CA 2066599 C 19960730; DE 69028207 D1 19960926; DE 69028207 T2 19970116; EP 0491822 A1 19920701; EP 0491822 B1 19960821; ES 2091828 T3 19961116; GB 8920733 D0 19891025; JP 2834323 B2 19981209; JP H05500295 A 19930121; KR 100201474 B1 19990615; KR 920704465 A 19921219; US 5331452 A 19940719
DOCDB simple family (application)
GB 9001416 W 19900913; AT 90914228 T 19900913; AU 6415290 A 19900913; CA 2066599 A 19900913; DE 69028207 T 19900913; EP 90914228 A 19900913; ES 90914228 T 19900913; GB 8920733 A 19890913; JP 51331790 A 19900913; KR 920700577 A 19920314; US 84898392 A 19920420